i have a aftermarket catback or to u just want the muffler. the pipes are 2.25 and the muffler is 4.5 tip. its a n1 style catback. i send u pix if you send me email. it like brand new i still have the box it came with. i was going to put it on my mp5 but i sold it.then i try put it on my mp and the shop guy said it did not fit. so i am try to sell it. the catback would be 150 plus shipping because ur in hawaii. if you want the muffler its 100 plus shipping. let me know